x3 - 7x - 6 = x3 - x-6x - 6 = x x2-1 -6 x+1 = x+1 x x-1 -6 = x+1 x2 - x - 6 = x+1 x2 - 3x + 2x -6 = x+1 x x+3 +2 x-3 = x+1 x+2x-3
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